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Area of a parallelogram

The area of a parallelogram can be calculated with the following formulasA=haaA=hbb \begin{aligned} A &= h_a \, a \\ A &= h_b \, b \end{aligned} with a side aa or bb and the belonging height hah_a or hbh_b known in the parallelogram. The formula originates from the one for rectangles.